Doctor&#39;s stool



DoCToRs sToovL Filed June 29, 1954 ,9 INVENToR.

Patented Apr. 28, 1936 UNITED STATES PATENT OFFICE 1 Claim.

The invention relates to a stool which while in use can be tipped back, forward or rotated right or left by the movement of the person sitting upon it. The stool has no moving parts except those involved in the adjustment to raise or lower the height of the seat to suit the personal desire of the user.

The invention is illustrated in the accompanying drawing, in which the gure is a vertical section of the entire stool.

The base I and the seat 'I are aluminum alloy castings and the base is made to flt the pillar 2 whichv is a seamless steel tube fitted to the base I, and a seamless steel tube 3 is tted to the seat casting I and inside of the pillar tube 2.

The reinforcing steel tubing collar 4 fits over the pillar 2 to give additional strength to the pillar 2 and also added thickness to receive the threads for the locking thumbscrew 5 which is used to lock the seat at the desired height by having the end of the screw 5 extend into the holes 5 along the inner tube 3.

The tube 3 is also provided with a slot I I in its wall and extending along its axis. A set screw I0 or the like is provided in the collar 4 to project through slot II, thereby cooperating with thumbscrew 5 to prevent the seat from turning with respect to the base which serves to keep the holes 5 radially in alignment with the thumbscrew 5.

The tapered pins 6 secure the base I to the pillar 2 and also the seat 'I to the tubing 3.

'I'he seat I is covered by a filler 8 which may .be made of cork, leather, plush or any other desired material. Y

A filler disc 9 made of non-slip material such as compressed cork, rubber, felt or the like is provided in the base I. The base I is recessed to receive the ller so that the same will project beyond the rim of the base.

'I'he amount of tilt that can be given the seat 'I can be regulated by thickening or thinning the ller 9.

I claim:

A stool having a telescoping two-piece upright member, a seat portion supported by said upright member, a base secured to the lower end of said upright member comprising a member having a 20 relatively large surface concentric with the upright member, and having an undercut outer edge portion, the under side of said surface being furnished with a, recess carrying a pad member concentric with the outer edge and of a smaller ra- 25 dius, with its lower surface at a lower horizontal plane than that of the lowest edge of the undercut portion.

FREDERICK SELLAR. 

